Low cost and quite precise DIY Particulate Matter Monitor. This DIY device will allow to measure PMs, Temperature, Humidity and Barometric Pressure for less than US $30.

I am not going to describe the whole process of building the device because it is well explained by the author at ourairquality.org. You can find a ton of information about the sensors and the electronics on his article.

• It uses the Plantower PMS5003 which is a low cost laser particle counter ∼US $18.5
• ESP8266 Nodemcu is a WiFi enabled computer board ∼US $3.2
• BME280 is a Temperature, Humidity and Barometric Pressure Sensor ∼US $4.9

• DS3231 is a Precision RTC Clock Module Memory ∼US $2

• It is Micro USB Powered

For more info visit: https://ourairquality.org/index.php/build-an-air-quality-monitor/